一种适用于生物医学信号采集的高线性度VGA  

A High Linearity VGA for Biomedical Signal Acquisition

作　　者：岳宏卫[1] 肖鑫 翁浩然 杨俊[1] 徐卫林[1] 段吉海[1] YUE Hongwei;XIAO Xin;WENG Haoran;YANG Jun;XU Weilin;DUAN Jihai(Guangxi Key Laboratory of Precision Navigation Technology and Application,Guilin University of Electronic Technology,Guilin,Guangxi 541004,P.R.China)

机构地区：[1]桂林电子科技大学广西精密导航技术与应用重点实验室,广西桂林541004

出　　处：《微电子学》2021年第4期500-504,共5页Microelectronics

基　　金：国家自然科学基金资助项目(12064003,62064002);桂林电子科技大学研究生教育创新计划项目(2020YCXS034,2019YCXS032)。

摘　　要：传统VGA线性度较低,不适用于生物医学应用。文章分析了基于可编程跨导器的传统结构,得出环路增益和失真的关系,并基于此采用增益提升技术提高环路增益,设计了一种新型的基于可编程跨导器的VGA,提高了VGA的线性度。仿真结果表明,在1.2 V电源电压下,电路消耗电流为10μA,在0~30 mV的输入信号幅度范围内,VGA的总谐波失真不高于0.5%,IM3减小14 dB,IIP3为18.57 dBm,在0.1 Hz~100 kHz范围内,等效输入噪声为616 nV。Traditional VGA is not suitable for biomedical applications because of its low linearity.In this paper,the traditional structure based on programmable transconductance was analyzed,and the relationship between loop gain and distortion was obtained.Based on this,a new type of VGA based on programmable transconductance was designed,which improved the linearity of VGA.The simulation results showed that the current consumption of the circuit was 10μA at 1.2 V supply voltage and 0~30 mV input signal amplitude range.The total harmonic distortion of VGA was less than 0.5%,the IM3 was reduced by 14 dB,the IIP3 was 18.57 dBm,and the equivalent input noise was 616 nV in the range of 0.1 Hz to 100 kHz.

关 键 词：生物医学应用 高线性度 可变增益放大器 增益提升技术 

分 类 号：TN432[电子电信—微电子学与固体电子学]